CHM 2046L Lab Report #5

CHM 2046L Lab Report #5 - Thermochemistry Brett Larose...

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Thermochemistry Brett Larose Coworker: Adam CHM 2046L Section # 19 2/25/2009 Objectives
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The main purpose of this experiment is to understand temperature, heat, and heat capacity. Another objective of this experiment is to be able to calibrate a simple calorimeter, which is used to measure the specific heat of the metal and the heat of the solution. Materials/Equipment Styrofoam cup (2) Thermometer Cardboard lid Stirring rod Cork Test tube Cooler of ice (ice bath) Hot plate 100-mL graduated cylinder 250-mL beaker 600-mL beaker De-ionized Water Chemicals Used Unknown metals (1, 2, 3, 4) Procedure
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To initiate the experiment, a Styrofoam cup calorimeter (consisting of two coffee cups, a cardboard lid, and a thermometer attached to a cork) had to be constructed. One Styrofoam cup was placed inside the other, with the cardboard lid attached to the top. A thermometer was obtained, and was attached to a cork, which was placed through the center of the lid. In Part 1 of the experiment—after the coffee cup calorimeter was assembled—60 mL of de- ionized (DI) water was measured in a 100-mL graduated cylinder. Afterwards, the 60 mL of DI water was transferred into a test tube. The test tube was placed in an ice cooler until it reached C. Another 60 mL of DI water was measured in a graduated cylinder and transferred to a 250-mL beaker. The beaker was placed on a hot plate while the next step was followed thorough. While the beaker was heating up, the 100-mL graduated cylinder was used to measure exactly 50.0 mL of the chilled water, which was then added to the calorimeter. The temperature was recorded every 30 seconds for four minutes. The stirring rod was used every 30 seconds to mix the water. Afterwards, the heated water was at 78, and 50.0 mL of this water was transferred into a
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CHM 2046L Lab Report #5 - Thermochemistry Brett Larose...

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